[HBASE-15386] PREFETCH_BLOCKS_ON_OPEN in HColumnDescriptor is ignored - ASF JIRA

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This was a non-issue. The PREFETCH_... flag actually works. While here though made the following additions.

Changes the prefetch TRACE-level loggings to include the word 'Prefetch' in them so you know what they are about.

Changes the cryptic logging of the CacheConfig#toString to have some preamble saying why and what column family is responsible (helps figure what is going on)

Add test that verifies setting flag on HColumnDescriptor actually works.

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This was a non-issue. The PREFETCH_... flag actually works. While here though made the following additions. Changes the prefetch TRACE-level loggings to include the word 'Prefetch' in them so you know what they are about. Changes the cryptic logging of the CacheConfig#toString to have some preamble saying why and what column family is responsible (helps figure what is going on) Add test that verifies setting flag on HColumnDescriptor actually works.

We use the global flag hbase.rs.prefetchblocksonopen only and ignore the HCD setting.

Purge from HCD or hook it up again (it probably worked once).

Thanks to Daniel Pol for finding this one. Let me fix.